The Domain Name System (DNS) is a standard technology for managing the names of Web sites and other Internet domains. DNS technology allows you to type names into your Web browser like compnetworking.about.com and your computer to automatically find that address on the Internet. A key element of the DNS is a worldwide collection of DNS servers
A DNS server is any computer registered to join the Domain Name System. A DNS server runs special-purpose networking software, features a public IP address, and contains a database of network names and addresses for other Internet hosts
DNS Introduction : The internet works because every computer that is connected to it, all use the same protocol to communicate and to route traffic.Without this universal protocol the networks that make up the internet would not be able to route the information to the correct destination.
Network service used to TCP/IP network to translated HOST name to IP address,Every computer or device connected to the computer has an address. They are usually written in the form of four numbers separated by dots, as in: 192.168.0.1 These addresses are used by the routers on the Internet to send information from one place to another. They provide the destination address for each little packet of information sent. How that works doesn't really matter to us for now; it only matters that it works.
DNS RECORDS :
Starts of Authority Records(SOA Records) : SOA is a start of authority records,There are several interesting items in this record, only a couple of which we're concerned with here,Which is first record of DNS, which control the startup behavior DNS ,we can configure TTL , refresh, and retry intervals in this records,This SOA record identifies what is the best source of information for data within the domain. SOA contains the current version of the DNS database, and various other parameters that define the behavior of a particular DNS server.
Host Resources records(HR Records) : It resolve HOST name to IP address,It store computer name of the network of their respective IP address.
Name Service Records(NS Records) : An NS (name server) record allows you to delegate a sub domain of your domain to another name server,It contain name all DNS server,NS R Rs are required because DNS queries respond with an authority section listing all the authoritative name servers, for sub-domains or queries to the zones parent where they are required to allow referral to take place.
Mail Exchange Records(MX Records) : It is use for e-mail Exchange server to deliver to mail query the Mail exchange resources record is used by e-mail application to locate a mail server within a Zone, A zone can have one or more Mail Exchange (MX) records. These records point to hosts that accept mail messages on behalf of the host. A host can be an 'MX' for itself. MX records need not point to a host in the same zone,Additionally an MX record has a host name to allow email addresses with sub domains. The host name is usually left blank to specify the mail server for the domain name on its own.
Pointer Records(Pointer Resources Records) : It resolve IP address to FQDN(fully qualify domain name) so it is reserves of Host records,Pointer (PTR) records are used only in reverse domains. There must be exactly one PTR record for each Internet address.
Service Location Resource Records (SRV Records) :Service Location Resource Records are used to specify the location of specific service in domain.
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DNS means Domain Name Server or Domain Name System.DNS translates ip addresses into names which are easy read and remember for people. Web servers are ultimately accessed by an I.P. address. When you send a request for a web page that contains a domain name that name has been translated into the I.P. address of the server along the way. There are Domain Name Servers all across the internet that accomplish this task. You set up DNS entries on one server and those setting will propagate across all the other servers around the world. You need to set up at least two different DNS records. One is a "C Name" record (common name). This is to match up your domain (i.e. example.com) with the I.P. address of the server the website files resides on. You also need to set up an "A Name" record (alias name). You set this to point another version of your domain name to what you set up as your C Name. Specifically you need to point your domain name with a "www." to the one without (so that people will get your site no mater how they type your domain name in the address bar). In other words, you use the A Name record to point www.example.com to example.com and then the C Name record points domain.com to the I.P. address of the server .You can check the DNS records like A record,C name record ,MX record,D name,MX records etc.. details at Whoisxy.com
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